Is the blood in your veins blue?
No. The evidence does not support this claim.
Deoxygenated blood in your veins is blue.
What the evidence shows
Human blood is always red. Oxygen-rich blood is bright cherry red and oxygen-poor blood is a darker, burgundy red, but it is never blue. Veins look bluish because of how light passes through skin: longer red wavelengths are absorbed while shorter blue-green wavelengths scatter back to the eye, creating the illusion of blue vessels.
This summary describes a fact-check originally published by Live Science. FactGuard did not conduct this review; we summarize it and link to the original. Read the original fact-check by Live Science →
Sources
- Live Science
- Hematology / optics of skin
Published 2026-06-07 · Last reviewed 2026-06-07
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